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Número de pieza | M5295AL | |
Descripción | WATCHDOG TIMER | |
Fabricantes | Mitsubishi | |
Logotipo | ||
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No Preview Available ! MITSUBISHI<Dig.Ana.INTERFACE>
M5295AL/P/FP
WATCHDOG TIMER
DESCRIPTION
M5295A is a semiconductor integrated circuit which is
designed for System Reset to detect +5V power supply.
This IC keeps the operation microcomputer watching.
When the system is abnormal,it generates Reset output until the
system returns to normal states of the System.
It is possible to vary the two detective voltage by connecting the
resistor,so it is suitable to high quality and high performance
system.
FEATURES
•Watch Dog Timer
•Power on Reset Timer
•Low circuit current 0.8mA(Typ,Vcc=5V)
•Wide Range of power supply
PIN CONFIGURATION (TOP VIEW)
8 ADJ2
7 RST2
6 Vcc
5 ADJ1
4 GND
3 RST1
2 TC
1 WD
Outline 8P5(AL)
APPLICATION
Microcomputer Systems
RECOMMENDED OPERATING CONDITIONS
Supply voltage...........................................4V to 15V
Rated supply voltage............................................5V
WD 1
TC 2
RST1 3
GND 4
8 ADJ2
7 RST2
6 Vcc
5 ADJ1
Outline 8P4(AP)
8P2S-A(AFP)
BLOCK DIAGRAM
F.F
F.F
-
+
-
+
49.6k
-
+
20.4k
51.2k
18.8k
W.D.T
20k 30k
F.F
1.24V
REFERENCE VOLTAGE
GENERATOR CIRCUIT
12 3 4 5 678
WD
TC
RST1
GND
ADJ1
Vcc RST2 ADJ2
MITSUBISHI
ELECTRIC
( 1/8 )
1 page 3.Relationship between Input Pulse
Width and Input Capacitance Cin
When input to pin 1 is 1.5V or more,TC pin
discharges electricity. Determine pulse width and
input capacitance Cin with reference to the diagram
shown on the right.
VIN
1
Cin
30k
20k
Q1
Q1 is off when voltage at pin 1 is 1.5V or less.
t3=Cin•5X104 •In
Vin
1.5
RST1 is output when t4 is longer than tWD.
MITSUBISHI<Dig.Ana.INTERFACE>
M5295AL/P/FP
WATCHDOG TIMER
Vin
VIN
Vin
WD 1.5V
1
t3
TC
2
RST1
3
t4
tWD
4V
2V
t
t
t
t
Cin:10.000pF,t3=0.6ms
Cin:1000pF,t3=0.6µs
Cin:100pF,t3=6µs
When t3 is too long,TC pin output waveform frequency
changes as shown above.Set t3 to be sufficiently long
to turn on Q1[tWDIN(3µs)or more] but not to exceed
t2(Discharge time).
(t2:Discharge time during normal input)
4.Vcc Detection Voltage Adjustment
(1)Detection voltage 1(VTH1)adjustment.
6
R1 49.6k
RL
5+
-
R2 20.4k
1.24V
3
4
VTH1(V) R1(kΩ) R2(kΩ) Detection voltage calculation formula
13 10 0.92
10
10
1.25
VTH1= R01+R02
R02
X1.24(V)
7 10 1.96
5 10 3.17
4.25
R01=R1//49.6kΩ
R02=R2//20.4kΩ
4 10.90 5
3.5 8.59 5
To adjust detection voltage 1,determine external resistance
with the following equation:
a. VTH>4.25V(R1=10kΩ)
R2= 1
1
-
1
R0 20.4k
R0= 8.322kX1.24
VTH1-1.24
b. VTH1<4.25V(R2=5kΩ)
R1= 1
1
-
1
R0 49.6k
R0= (VTH1-1.24)4.016k
1.24
MITSUBISHI
ELECTRIC
( 5/8 )
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet M5295AL.PDF ] |
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